Thermodynamic Study of Formamidinium Lead Iodide (CH<sub>5</sub>N<sub>2</sub>PbI<sub>3</sub>) from 5 to 357 K
Andrea Ciccioli,
Alessandro Latini,
Alessio Luongo,
Natalia N. Smirnova,
Alexey V. Markin,
Stefano Vecchio Ciprioti
Affiliations
Andrea Ciccioli
Department of Chemistry, Sapienza University of Rome, P.le A. Moro 5, Building CU014, I-00185 Rome, Italy
Alessandro Latini
Department of Chemistry, Sapienza University of Rome, P.le A. Moro 5, Building CU014, I-00185 Rome, Italy
Alessio Luongo
Department of Chemistry, Sapienza University of Rome, P.le A. Moro 5, Building CU014, I-00185 Rome, Italy
Natalia N. Smirnova
Department of Chemistry, National Research Lobachevsky State University of Nizhny Novgorod, 23/5 Gagarin Av., 603950 Nizhny Novgorod, Russia
Alexey V. Markin
Department of Chemistry, National Research Lobachevsky State University of Nizhny Novgorod, 23/5 Gagarin Av., 603950 Nizhny Novgorod, Russia
Stefano Vecchio Ciprioti
Department of Basic and Applied Science for Engineering (S.B.A.I.), Sapienza University of Rome, Via del Castro Laurenziano 7, Building RM017, I-00161 Rome, Italy
In the present study, the molar heat capacity of solid formamidinium lead iodide (CH5N2PbI3) was measured over the temperature range from 5 to 357 K using a precise automated adiabatic calorimeter. In the above temperature interval, three distinct phase transitions were found in ranges from 49 to 56 K, from 110 to 178 K, and from 264 to 277 K. The standard thermodynamic functions of the studied perovskite, namely the heat capacity C°p(T), enthalpy [H0(T) − H0(0)], entropy S0(T), and [G°(T) − H°(0)]/T, were calculated for the temperature range from 0 to 345 K based on the experimental data. Herein, the results are discussed and compared with those available in the literature as measured by nonclassical methods.
